Dual ISP at HQ and Single ISP at Branch with Multiple GRE tunnels between
HQ has dual ISPs (a.b.c.d is fa0/0 and e.f.g.h is dialer1). Branch has single ISP (i.j.k.l is fa0/0). Both sides are using Cisco 2621 routers.
There are two GRE tunnels created between the HQ and Branch offices. On the HQ side Tunnel0 (ip = x.x.x.1/30, source = fa0/0 of the hq router, and destination = fa0/0 of the branch router) - Tunnel1 (ip = x.x.x.5/30, source = dialer1 of the hq router, and destination = fa0/0 of the branch router). On the Branch side Tunnel0 (ip = x.x.x.2/30, source = fa0/0 of the branch router, and destination = fa0/0 of the hq router) - Tunnel1 (ip = x.x.x.6/30, source = fa0/0 of the branch router, and destination = dailer1 of the hq router).
Private LAN info. For the HQ side the private LAN is 10.10.10.0/24 and for the Branch side the private LAN is 192.168.10.0/24.
Here are the static routes.
0.0.0.0 0.0.0.0 dialer1 5
0.0.0.0 0.0.0.0 fa0/0 10
192.168.10.0 255.255.255.0 Tunnel0 5
192.168.10.0 255.255.255.0 Tunnel1 10
0.0.0.0 0.0.0.0 fa0/0
10.10.10.0 255.255.255.0 Tunnel0 5
10.10.10.0 255.255.255.0 Tunnel1 10
Desired End Result
What I would like to do is use dialer1 on the HQ side to be my primary Internet connection for that office and fa0/0 for the backup Internet connection for that office. Also, on the HQ side I would like to use Tunnel0 as my primary link to the branch office and Tunnel1 as my backup link to the branch office. On the Branch office side I would like to use Tunnel0 as my primary link to the hq office and Tunnel1 as my backup link to the hq office.
On the HQ side dialer1 is both the primary Internet connection for that office (this is what I want), but Tunnel1 is the primary link to the branch office (not what I want). On the Branch side Tunnel1 is the primary link to the hq office (not what I want)
Please let me know if you have questions or need additional information.
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